View of the Conoco oil refinery at 5801 Brighton Boulevard in Commerce City (Adams County), Colorado. A large sign near the road reads: "CONOCO." Shows the tanks, towers, and pipes that make up the refinery. Overhead power lines run to the towers....

View of the United Oil Company refining works in Florence, (Fremont County) Colorado. Shows Denver and Rio Grande railroad tracks and freight cars, warehouses, oil storage tanks, and a mill building. Signs on buildings in the area read: "The United...

Men look into a window of a brokerage office in Denver, Colorado. A miniature oil derrick is on display in the window. The words: "Boulder. Florence. Pagosa Spgs. Debeque." and "Oil Stocks and Broker [?]" are painted on the window.

Men pose outdoors near the Oil Exchange and Board of Trade in the Albany Hotel building at 17th (Seventeenth) and Stout Streets in downtown Denver, Colorado. An automobile is parked nearby. A sign reads: "A. G. Clarke's Drug Co."

Harry Brown poses in an oil shale processing facility at the Index Shale Oil Company in De Beque (Mesa County) Colorado; he poses beside a Brown retort (he is probably the inventor) that consists of a hopper, rotating tanks, and exhaust stacks.

A man stands near the oil shale processing facility at the Index Shale Oil Company in De Beque (Mesa County) Colorado, Shows a Brown retort, a conveyor belt elevator for tailings, exhaust stacks, and sheds. The Roan Cliffs are in the distance.

View of an American Shale Refining Company oil shale processing facility near De Beque (Mesa County) Colorado; shows dormitories and outhouses. Road grade and tailings are on slopes of the Roan Cliffs.

A survey team breaks camp near Fourmile Creek in Fremont County, Colorado. Burros are loaded with equipment, bedrolls, and a table. A team of railroad surveyors stand interspersed with the burros. One man holds a stadia rod in his hand. A canvas...